F14 cpuspeed / ondemand broken?

[Steven Haigh]

On 1/01/2011 1:49 AM, Richard Shaw wrote:
> I wish I could find the site where I got this information as my
> recollection of it is a bit hazy but part of your problem may be that
> the p4-clockmod and ondemand are more or less incompatible. I remember
> reading something on kerneltrap or something. Basically the latency of
> changing frequencies are so bad with p4-clockmod that ondemand gives
> up on it or something like that. I think I could force it to work on
> my Celeron based EEEPC by manually setting the governor something like
> this[1]:
>
> ---
> Using Frequency Scaling Governors
>
> You can get a list of available governors with (as root):
> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
> conservative ondemand powersave userspace performance
>
> Note: If the governors are compiled as modules, load them first:
> # modprobe cpufreq_performance cpufreq_ondemand cpufreq_conservative
> cpufreq_powersave cpufreq_userspace
>
> Now we set our governor: What is our current governor?
> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> userspace
>
> Set new governor and watch if it has changed
> # echo conservative>  /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> conservative
>
> Congrats! Your governor is active.
> You may set the governor in your rc.local, to make it used on every boot.
> ---
>
> Richard
>
> [1] http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling

Interestingly enough, I tried setting the governor to userspace. Now 
when I run /etc/init.d/cpuspeed start, I can see the CPU speed scale. It 
isn't as quick as the kernel ondemand governor, but it does scale up and 
down with load.

This makes me quite curious.

-- 
Steven Haigh

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